PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-16:12:40
G01     54.5           27.8                7.8 +/-    1.63      14.3 +/-    1.63  0.030 / 0.040
G06     178.7          20.4               10.1 +/-    2.23      22.0 +/-    2.23  0.030 / 0.040
G07     144.1          14.0                8.3 +/-    2.71      21.2 +/-    2.71  0.190 / 0.270
G11     45.3           16.5                8.4 +/-    2.04      20.3 +/-    2.04  0.090 / 0.270
G13     258.3          32.8                8.8 +/-    1.80      14.5 +/-    1.80  0.050 / 0.110
G17     299.2          80.0               10.1 +/-    0.49      10.2 +/-    0.49  0.050 / 0.130
G19     240.2          57.8                9.5 +/-    1.91      11.0 +/-    1.91  0.030 / 0.020
G28     44.7           54.7                9.6 +/-    0.95      11.5 +/-    0.95  0.020 / 0.020
G30     147.0          49.2               10.0 +/-    0.67      12.7 +/-    0.67  0.080 / 0.120